Skiopticon image from the Department of Photography at the Royal Institute of Technology. Use by Professor Helmer Bäckström as lecture material. Bäckström was Sweden's first professor in photography at the Royal Institute of Technology in Stockholm photography - audio film. The right film shows audio tracks according to the intensity method. For more info see: Bäckström, Helmer. Photographic manual. Other revised edition. Nature and Culture. Stockholm. 1948. p. 1299.

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Size: 2347px × 2130px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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